Re: [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions
Peter Psenak <ppsenak@cisco.com> Mon, 29 December 2014 08:56 UTC
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Date: Mon, 29 Dec 2014 09:56:29 +0100
From: Peter Psenak <ppsenak@cisco.com>
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To: Shraddha Hegde <shraddha@juniper.net>, "draft-ietf-ospf-segment-routing-extensions@tools.ietf.org" <draft-ietf-ospf-segment-routing-extensions@tools.ietf.org>, "draft-ietf-isis-segment-routing-extensions@tools.ietf.org" <draft-ietf-isis-segment-routing-extensions@tools.ietf.org>
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Subject: Re: [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions
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Shraddha, I do not see how an originator of the node-sid can mandate a protection for the prefix on other routers. What if there is no backup available on a certain node along the path? The parallel with the B-flag in adj-sids is not right - in case of adj-sid the originator has the knowledge about the local adjacency protection and as such can signal it it it's LSA. thanks, Peter On 12/29/14 09:47 , Shraddha Hegde wrote: > Peter, > > > Pls see inline. > > Rgds > Shraddha > > -----Original Message----- > From: Peter Psenak [mailto:ppsenak@cisco.com] > Sent: Monday, December 29, 2014 2:02 PM > To: Shraddha Hegde; draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; draft-ietf-isis-segment-routing-extensions@tools.ietf.org > Cc: ospf@ietf.org; isis-wg@ietf.org > Subject: Re: [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions > > Shraddha, > > I do not see how an originator can set any flag regarding the protection of the locally attached prefix. > <Shraddha> The originator advertises 2 node-sids. One with p flag set and the other without the p-flag set. > > It's all the routers on the path towards such prefix that need to deal with the protection. > <Shraddha> The receiving nodes will download protected path for the node-sid with p-flag set and download > Unprotected path for the node-sid with p-flag unset. > > Signaling anything from the originator seems useless. > <Shraddha> For node-sids it's the others who need to build the forwarding plane but it's only the originator who can signal which of > Sid need to be built with protection and which not. Other routers on the path cannot signal this information. > > With this you have two paths for the node. One is protected and the other is unprotected. This meets the requirement of having an un-protected path. > > It's very much in parallel to B-flag in adj-sids. It is similar to advertising multiple adj-sids one with B-flag on and other with b-flag off , to get protected and unprotected > Adj-sids. > > thanks, > Peter > > On 12/29/14 09:26 , Shraddha Hegde wrote: >> Yes.You are right. >> >> Lets say a prefix sid has a flag "p flag". If this is on it means build a path and provide protection. >> If this is off it means build a path with no protection. >> The receivers of the prefix-sid will build forwarding plane based on this flag. >> >> The applications building the paths will either use prefix-sids with p flag on or off based on the need of the service. >> Rgds >> Shraddha >> >> >> -----Original Message----- >> From: Peter Psenak [mailto:ppsenak@cisco.com] >> Sent: Monday, December 29, 2014 1:49 PM >> To: Shraddha Hegde; >> draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; >> draft-ietf-isis-segment-routing-extensions@tools.ietf.org >> Cc: ospf@ietf.org; isis-wg@ietf.org >> Subject: Re: [Isis-wg] Mail regarding >> draft-ietf-ospf-segment-routing-extensions >> >> Shraddha, >> >> the problem is that the node that is advertising the node-sid can not advertise any data regarding the protection of such prefix, because the prefix is locally attached. >> >> thanks, >> Peter >> >> On 12/29/14 09:15 , Shraddha Hegde wrote: >>> Peter, >>> >>> If there is a service which has to use un-protected path and while >>> building such a path if the node-sids Need to be used (one reason >>> could be label stack compression) , then there has to be unprotected node-sid that this service can make use of. >>> >>> Prefix -sids could also be used to represent different service >>> endpoints which makes it even more relevant to have A means of representing unprotected paths. >>> >>> Would be good to hear from others on this, especially operators. >>> >>> Rgds >>> Shraddha >>> >>> >>> -----Original Message----- >>> From: Peter Psenak [mailto:ppsenak@cisco.com] >>> Sent: Monday, December 29, 2014 1:35 PM >>> To: Shraddha Hegde; >>> draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; >>> draft-ietf-isis-segment-routing-extensions@tools.ietf.org >>> Cc: ospf@ietf.org; isis-wg@ietf.org >>> Subject: Re: [Isis-wg] Mail regarding >>> draft-ietf-ospf-segment-routing-extensions >>> >>> Shraddha, >>> >>> node-SID is advertised by the router for the prefix that is directly attached to it. Protection for such local prefix does not mean much. >>> >>> thanks, >>> Peter >>> >>> On 12/24/14 11:57 , Shraddha Hegde wrote: >>>> Authors, >>>> We have a "backup flag" in adjacency sid to indicate whether the >>>> label is protected or not. >>>> Similarly. I think we need a flag in prefix-sid as well to indicate >>>> whether the node-sid is to be protected or not. >>>> Any thoughts on this? >>>> Rgds >>>> Shraddha >>>> >>>> >>>> _______________________________________________ >>>> Isis-wg mailing list >>>> Isis-wg@ietf.org >>>> https://www.ietf.org/mailman/listinfo/isis-wg >>>> >>> >>> . >>> >> >> . >> > > . >
- [Isis-wg] Mail regarding draft-ietf-ospf-segment-… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Peter Psenak
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Peter Psenak
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Peter Psenak
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Peter Psenak
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Rob Shakir
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Rob Shakir
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Rob Shakir
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Peter Psenak
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Peter Psenak
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Shraddha Hegde
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Mail regarding draft-ietf-ospf-segm… Peter Psenak
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Pushpasis Sarkar
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Pushpasis Sarkar
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Shraddha Hegde
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Pushpasis Sarkar
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Pushpasis Sarkar
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Shraddha Hegde
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… stephane.litkowski
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Rob Shakir
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… stephane.litkowski
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Jeff Tantsura
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Mitchell Erblich
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… stephane.litkowski
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… stephane.litkowski
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… bruno.decraene
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… stephane.litkowski
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… bruno.decraene
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Henderickx, Wim (Wim)
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… stephane.litkowski
- Re: [Isis-wg] [OSPF] Mail regarding draft-ietf-os… Henderickx, Wim (Wim)